/*
 * Copyright (c) 2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 function getData(callback: (result: number) => void): void {
    setTimeout(() => {
        const result = 1;
        console.log("getData completed:", result);
        callback(result);
    }, 500);
}

function getMoreData(input: number, callback: (result: number) => void): void {
    setTimeout(() => {
        const result = input + 1;
        console.log("getMoreData completed:", result);
        callback(result);
    }, 500);
}

getData(function (a) {
    getMoreData(a, function (b) {
        getMoreData(b, function (c) {
            getMoreData(c, function (d) {
                console.log("Final data:", d);
                // 回调地狱
            });
        });
    });
});
